Add save and load node, part of #62

interface/menus/save_and_load/LoadButton.tscn

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+[gd_scene format=2]
+
+[node name="LoadButton" type="Button"]
+
+anchor_left = 0.0
+anchor_top = 0.0
+anchor_right = 0.0
+anchor_bottom = 0.0
+margin_right = 200.0
+margin_bottom = 62.0
+rect_pivot_offset = Vector2( 0, 0 )
+rect_clip_content = false
+focus_mode = 2
+mouse_filter = 0
+mouse_default_cursor_shape = 0
+size_flags_horizontal = 3
+size_flags_vertical = 3
+toggle_mode = false
+enabled_focus_mode = 2
+shortcut = null
+group = null
+text = "Load ID 1"
+flat = false
+align = 1
+
+

interface/menus/save_and_load/SaveButton.tscn

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+[gd_scene format=2]
+
+[node name="SaveButton" type="Button"]
+
+anchor_left = 0.0
+anchor_top = 0.0
+anchor_right = 0.0
+anchor_bottom = 0.0
+margin_right = 200.0
+margin_bottom = 62.0
+rect_pivot_offset = Vector2( 0, 0 )
+rect_clip_content = false
+focus_mode = 2
+mouse_filter = 0
+mouse_default_cursor_shape = 0
+size_flags_horizontal = 3
+size_flags_vertical = 3
+toggle_mode = false
+enabled_focus_mode = 2
+shortcut = null
+group = null
+text = "Save ID 1"
+flat = false
+align = 1
+
+

interface/menus/save_and_load/SaveUI.gd

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+extends Control
+
+func get_save_buttons():
+	return $Row/SaveButtons.get_children()
+
+func get_load_buttons():
+	return $Row/LoadButtons.get_children()

interface/menus/save_and_load/SaveUI.tscn

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+[gd_scene load_steps=5 format=2]
+
+[ext_resource path="res://interface/theme/default.theme" type="Theme" id=1]
+[ext_resource path="res://interface/SaveUI.gd" type="Script" id=2]
+[ext_resource path="res://interface/SaveButton.tscn" type="PackedScene" id=3]
+[ext_resource path="res://interface/LoadButton.tscn" type="PackedScene" id=4]
+
+[node name="SaveUI" type="Control" index="0"]
+
+anchor_left = 0.0
+anchor_top = 0.0
+anchor_right = 0.0
+anchor_bottom = 0.0
+margin_right = 448.0
+margin_bottom = 160.0
+rect_pivot_offset = Vector2( 0, 0 )
+rect_clip_content = false
+mouse_filter = 0
+mouse_default_cursor_shape = 0
+size_flags_horizontal = 1
+size_flags_vertical = 1
+theme = ExtResource( 1 )
+script = ExtResource( 2 )
+_sections_unfolded = [ "Theme" ]
+
+[node name="Row" type="HBoxContainer" parent="." index="0"]
+
+anchor_left = 0.0
+anchor_top = 0.0
+anchor_right = 1.0
+anchor_bottom = 1.0
+margin_left = 32.0
+margin_top = 32.0
+rect_pivot_offset = Vector2( 0, 0 )
+rect_clip_content = false
+mouse_filter = 1
+mouse_default_cursor_shape = 0
+size_flags_horizontal = 1
+size_flags_vertical = 1
+custom_constants/separation = 16
+alignment = 0
+_sections_unfolded = [ "custom_constants" ]
+
+[node name="SaveButtons" type="VBoxContainer" parent="Row" index="0"]
+
+anchor_left = 0.0
+anchor_top = 0.0
+anchor_right = 0.0
+anchor_bottom = 0.0
+margin_right = 200.0
+margin_bottom = 128.0
+rect_pivot_offset = Vector2( 0, 0 )
+rect_clip_content = false
+mouse_filter = 1
+mouse_default_cursor_shape = 0
+size_flags_horizontal = 3
+size_flags_vertical = 1
+alignment = 1
+
+[node name="SaveButton" parent="Row/SaveButtons" index="0" instance=ExtResource( 3 )]
+
+margin_bottom = 56.0
+
+[node name="SaveButton2" parent="Row/SaveButtons" index="1" instance=ExtResource( 3 )]
+
+margin_top = 72.0
+margin_bottom = 128.0
+text = "Save ID 2"
+
+[node name="LoadButtons" type="VBoxContainer" parent="Row" index="1"]
+
+anchor_left = 0.0
+anchor_top = 0.0
+anchor_right = 0.0
+anchor_bottom = 0.0
+margin_left = 216.0
+margin_right = 416.0
+margin_bottom = 128.0
+rect_pivot_offset = Vector2( 0, 0 )
+rect_clip_content = false
+mouse_filter = 1
+mouse_default_cursor_shape = 0
+size_flags_horizontal = 3
+size_flags_vertical = 1
+alignment = 1
+
+[node name="LoadButton" parent="Row/LoadButtons" index="0" instance=ExtResource( 4 )]
+
+margin_bottom = 56.0
+
+[node name="LoadButton3" parent="Row/LoadButtons" index="1" instance=ExtResource( 4 )]
+
+margin_top = 72.0
+margin_bottom = 128.0
+text = "Load ID 2"
+
+

save/SaveAndLoad.gd

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+extends Node
+
+signal game_saved(id)
+signal game_loaded(id)
+
+onready var GAME_VERSION = ProjectSettings.get_setting("application/config/version")
+var SAVE_DIRECTORY = "res://save/" if ProjectSettings.get_setting("application/config/debug") else "res://user/"
+const SAVE_FILE_EXT = ".game"
+
+func save_game(id):
+	var save_data = {
+		"version": GAME_VERSION,
+		"data": []
+	}
+	# Get nodes in group works in tree order, from top to bottom
+	# So we are guaranteed to get the parent first
+	for node in get_tree().get_nodes_in_group("save"):
+		var node_save_data = node.get_save_data()
+		assert node_save_data["filename"] != ""
+		assert node_save_data["parent"] != ""
+		save_data["data"].append(node_save_data)
+
+	var directory = Directory.new()
+	if not directory.dir_exists(SAVE_DIRECTORY):
+		directory.make_dir_recursive(SAVE_DIRECTORY)
+
+	var path = get_save_file_path(id)
+	var file = File.new()
+	file.open(path, File.WRITE)
+	file.store_string(to_json(save_data))
+	file.close()
+	emit_signal("game_saved", id)
+
+func load_game(id):
+	var path = get_save_file_path(id)
+	var file = File.new()
+	if not file.file_exists(path):
+		print("Couldn't load: file %s does not exist." % path)
+		return
+	file.open(path, File.READ)
+	var save_data = parse_json(file.get_as_text())
+	file.close()
+
+	for node in get_tree().get_nodes_in_group("save"):
+		node.queue_free()
+
+	for node_data in save_data["data"]:
+		var node = load(node_data["filename"]).instance()
+		get_node(node_data["parent"]).add_child(node)
+		var properties = node_data["properties"]
+		for property in properties.keys():
+			var value
+			if is_vector_2(property, node):
+				value = parse_vector_2(properties[property])
+			else:
+				value = properties[property]
+			node.set(property, value)
+	emit_signal("game_loaded", id)
+
+func get_save_file_path(id):
+	return SAVE_DIRECTORY + str(id) + SAVE_FILE_EXT
+
+func is_vector_2(property_name, node):
+	return typeof(node.get(property_name)) == typeof(Vector2())
+
+func parse_vector_2(json_string):
+	var numbers_string = json_string.substr(1, len(json_string) - 2)
+	var comma_position = numbers_string.find(",")
+	var value_x = float(numbers_string.left(comma_position))
+	var value_y = float(numbers_string.right(comma_position + 1))
+	return Vector2(value_x, value_y)

save/SaveAndLoad.tscn

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+[gd_scene load_steps=2 format=2]
+
+[ext_resource path="res://SaveAndLoad.gd" type="Script" id=1]
+
+[node name="SaveAndLoad" type="Node" index="0"]
+
+script = ExtResource( 1 )
+
+